Mobile device assisted coordinated multipoint transmission and reception
Idle mobile devices are used as cooperating devices to support coordinated multipoint transmission and reception for uplink and downlink communications between a primary mobile device and its serving base station. For uplink communications, the cooperating mobile devices receive the uplink transmission from the primary mobile device and retransmit the received data signal to the serving base station for the primary mobile device. For downlink communications, the cooperating mobile devices receive the downlink transmission from the serving base station and retransmit the received data signal to the primary mobile device.
1. A method of coordinated multipoint reception implemented by a primary mobile device, comprising:
receiving, by the primary mobile device, during one iteration of a hybrid automatic repeat request (HARQ) process, a first data signal transmitted by a serving base station;
in response to an acknowledgement signal transmitted by the primary mobile device to the serving base station, receiving, by the primary mobile device, during a subsequent iteration of the HARQ process and in a subframe following a subframe that the first data signal is received, a second data signal transmitted by a cooperating mobile device in a coordinating set for the primary mobile device, wherein the second data signal comprises a retransmission of the first data signal; and
combining the first and second data signals to produce a combined data signal.
2. The method of claim 1 , wherein the coordinating set includes at least one cooperating base station in the wireless communication network.
3. The method of claim 2 , wherein said receiving the second data signal is in cooperation with the first data signal being transmitted or received by the at least one cooperating base station.
4. The method of claim 1 , wherein the first data signal transmitted by the serving base station and the second data signal transmitted by the cooperating mobile device use a single radio access technology (RAT).
5. A primary mobile device in a wireless communication network capable of coordinated multipoint reception, comprising:
a transceiver circuit configured to transmit and receive signals over a wireless communication channel; and
a processing circuit including a coordinated multipoint control circuit and configured to:
receive, during one iteration of a hybrid automatic repeat request (HARQ) process, a first data signal transmitted by a serving base station;
receive, during a subsequent iteration of the HARQ process and in a subframe following a subframe that the first data signal is received, a second data signal transmitted by a cooperating mobile device in a coordinating set for the primary mobile device responsive to an acknowledgement signal transmitted by the primary mobile device to the serving base station, wherein the second data signal comprises a retransmission of the first data signal; and
combine the first and second data signals to produce a combined data signal.
6. The primary mobile device of claim 5 , wherein the coordinating set includes at least one cooperating base station in the wireless communication network.
7. The primary mobile device of claim 6 , wherein the processing circuit is further configured to:
receive the second data signal in cooperation with the first data signal being transmitted or received by the at least one cooperating base station.
8. The primary mobile device of claim 5 , wherein the first data signal transmitted by the serving base station and the second data signal transmitted by the cooperating mobile device use a single radio access technology (RAT).